自己写实体可以完美解决这个问题。
用匿名类型也可以。
设置上下文方法如下:
(jz为数据库上下文对象)
jz.Configuration.ProxyCreationEnabled = false;
jz.Configuration.LazyLoadingEnabled = false;
不用这个的原因是Virtual属性也会生成。(只是占个位,[]里面没内容,但看着不爽)
我采用的方法是过滤掉Virtual属性的方法:
一个基于Json.net的类
public class LimitPropsContractResolver : DefaultContractResolver
{
string[] props = null;
bool retain;
/// <summary>
/// 构造函数
/// </summary>
/// <param name="props">传入的属性数组</param>
/// <param name="retain">true:表示props是需要保留的字段 false:表示props是要排除的字段</param>
public LimitPropsContractResolver(string[] props, bool retain = true)
{
//指定要序列化属性的清单
this.props = props;
this.retain = retain;
}
protected override IList<JsonProperty> CreateProperties(Type type,
MemberSerialization memberSerialization)
{
IList<JsonProperty> list =
base.CreateProperties(type, memberSerialization);
//只保留清单有列出的属性
return list.Where(p =>
{
if (retain)
{
return props.Contains(p.PropertyName);
}
else
{
return !props.Contains(p.PropertyName);
}
}).ToList();
}
public static string[] GetVirtualList<T>()
{
var stringType = typeof(T);
var props = stringType.GetProperties();
List<string> test = new List<string>();
foreach (var prop in props)
{
if (prop.GetAccessors()[0].IsVirtual)
{
test.Add(prop.Name);
}
}
return test.ToArray();
}
}
和一个对PropertyInfo的扩展方法
public static class Virtual_Help
{
public static bool? IsVirtual(this PropertyInfo self)
{
if (self == null)
throw new ArgumentNullException("self");
bool? found = null;
foreach (MethodInfo method in self.GetAccessors())
{
if (found.HasValue)
{
if (found.Value != method.IsVirtual)
return null;
}
else
{
found = method.IsVirtual;
}
}
return found;
}
}
使用方法如下
JsonSerializerSettings jsetting = new JsonSerializerSettings(); jsetting.ContractResolver = new LimitPropsContractResolver( LimitPropsContractResolver.GetVirtualList<affairs>(), false); string json = JsonConvert.SerializeObject(temp, Formatting.Indented, jsetting);
EF 序列化实体为Json时的循环引用问题(不用自己写实体,不用匿名类型,不用EF的上下文属性)
原文:http://www.cnblogs.com/gaocong/p/5340676.html